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În alte clipuri am discutat

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despre faptul că elementele sunt definite

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de numărul de protoni

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pe care îl au în nucleu.

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Spre exemplu, fiecare atom cu exact 
un proton

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în nucleu este prin definiție hidrogen.

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Orice atom cu exact șase protoni în nucleu

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este prin definiție carbon,

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orice atom cu 17 protoni în nucleu

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este prin definiție clor,

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iar aceste numere pe care le încercuiesc 
pe tabelul

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periodic reprezintă numărul atomic,

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adică numărul de protoni din nucleul

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fiecărui atom în parte.

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Iar acesta ne arată tipul fiecărui 
element.

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Totuși, acum urmează să analizăm 
mai în amănunt

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și să realizăm că poți avea versiuni
diferite

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ale aceluiași element, aceste versiuni

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fiind cunoscute drept izotopi.

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